Tron: Legacy.
I picked that up for £8 from CEX the other day (incidentally, Days of Future Past 3D is in there for £12), but I wasn't that impressed with the 3D. Also, I couldn't get past how awful the AI Jeff Bridges looked.
I might persevere with it, just for the soundtrack.
Keef, I too have been pleasantly surprised how well 3D films translate to the living room. The films actually seem much crisper, and the 3D deeper and more effective, with much less ghosting. I have a passive system for the living room, but also have nVidia 3D vision shutter glasses set up on the PC. Games with A+ 3D ratings are absolutely stunning in 3D.
The shutter system seems to be deeper, and nVidia interface allows for adjusting it to get different effects. 'Toyification' is one of my faves in 3rd person games. It looks like you're controlling an action figure! World of Warcraft and Just Cause 2 were particularly good at that.